MailのSubjectをdecodeする

gistfile.py

from email.parser import Parser
from email.header import decode_header

fp = open("/path/to/mail.eml", "rb")
parser = Parser()
message = parser.parse(fp)
fp.close()

strs = []
for pair in decode_header(message['Subject']):
	subject = pair[0]
	encoding = pair[1]
	strs.append(subject if (encoding == None) else subject.decode(encoding))

print ' '.join(strs)

Quoted-printable: https://ja.wikipedia.org/wiki/Quoted-printable